IO2 LEWIS R. GARY. 



EXPLANATION OF PLATES. 



All the figures were drawn from specimens of A. pallida; those of the entire 

 laceration pieces from specimens grown in the laboratory; the sections from speci- 

 mens obtained at Beaufort, N. C. 



The ectoderm is stippled in all the figures, the endoderm is distinguished by the 

 presence of the zooxanthellae, the mesoglea has been represented by either a single 

 line in the actively growing parts of the embryo or by a clear space between the 

 cellular layers in the older tissues. 



PLATE I. 



The figures on this plate represent a series of stages in the development of a 

 laceration piece, from the time of its separation from the parent until it has assumed 

 the form of a typical young actinian. 



